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PROCESSING AND PROGRAM REQUIREMENTS
TLD THEORY
CALIBRATION AND TRACEABILITY
MAINTENANCE
ANOMALIES
100
The property of a material to produce light when heated.
What is Thermoluminescence?
100
1 mrem to 2000 rad
What is the exposure range of the DT-702/PD TLD?
100
Within 24 hours, prior to use.
What is the time frame that the CRV must be performed?
100
Remove metal items and clothing that could come into contact with electrical components or moving parts.
What is the safety precaution to take prior to performing any maintenance?
100
Line through the entry made in error. Write in the correct entry (if necessary). Initial and date.
What is the proper way to correct an erroneous entry?
200
Perform dosimetry processing with competence, integrity, and impartiality. Use and comply with a common set of NAVSEA approved SOPs.
What are the responsibilities of a Dosimetry Processor in order to contribute to the achievement of maintaining the dosimetry program integrity?
200
Segregate the failed TLD card or TLD holder. IMMEDIATELY notify dosimetry supervision or designee. Document the failed TLD card or holder on SOP-11 Attachement A form.
What are the actions taken when a damaged TLD card or holder fails inspection?
200
Converts the output from the PMT in nC to dosimetric units (mrem) for input into the algorithm.
What is the RCF?
200
C-14 and Sr-90.
What are the radioactive sources located inside the reader?
200
Identify malfunctions of the TLD reader. Identify defective dosimeters. Explain questionable dose algorithm results. Extract dose information.
What are the reasons for glow curve review?
300
Every two years for a primary lab.
What is the frequency of NVLAP proficiency testing?
300
Purple in color, used for calibration and calibration response verification of the reader, and establishing NIST traceability of the irradiator.
What is a Calibration Card?
300
The % difference between the pending RCF and the active RCF for each position does not exceed + or - 5%. The % standard deviation for each position does not exceed 5%
What is the criteria for a satisfactory protection range CRV?
300
Nitrogen gas can cause the displacement of oxygen. Liquid nitrogen has the ability to quickly freeze living tissue.
What are the safety hazards when handling nitrogen gas and liquid nitrogen?
300
External radiation exceeds NAVSEA limits. Unmonitored exposure greater than 1 mrem. Visitor exceeds their exposure control limit. Dosimetry Discrepancy (dose indicated by the TLD is greater or lesser than the assigned dose to the individual by more than 100 mrem)
What are some examples of incidents involving personnel radiation exposure?
400
Personnel dosimetry has medical and legal significance. Exposure data from personnel dosimetry is essential for minimizing exposure. Radiological controls are confirmed by dosimetry results.
What is why it is important to maintain the dosimetry program error free?
400
Damaged holder may cause an inaccurate dose result, damaged or lost TLD card. Damaged card may cause an inaccurate dose result or damage to the reader.
What is the significance of performing the inspections on the TLD card and the TLD holder?
400
To demonstrate that the delivered dose rate from the irradiator has not significantly changed from the last NIST traceable verification.
What is the significance of performing a NIST Traceability Test?
400
Check gas delivery system. Test Uninterruptible Power Supply (UPS). Perform Sr-90 Leak Test.
What are the maintenance items to be performed Semi-Annually?
400
TLD reader malfunction. Suspect TLD reading TLD reader operator error Damaged TLD TLD/PD discrepancy Lost TLD
What are some expamples of occurrences associated with reading and processing of personnel TLDs that require a formal investigation?
500
Radiation causes electrons in the material to become excited to a higher energy state until they fall and become trapped by impurities in the crystal. When heated, the electrons escape the traps, giving off light. The light given off is proportional to dose received.
What are the fundamental operating principles of thermoluminescence?
500
4 Thermoluminescent chips mounted between 2 Teflon sheets on an aluminum substrate with a label with an ID number appearing in both numeric and barcode formats
What are the component parts of the TLD card?
500
The adjustment of a TLD reader's electronic output to a known standard.
What is Calibration of the Model 8800 TLD reader?
500
Clean reference light sources and newly exposed track. Inspect carousel assembly, cartridges, and belts.
What are the maintenance items to be performed Quarterly?
500
Notify supervisor IMMEDIATELY. Do NOT touch the source mechanism. Do NOT use the reader. Document on the Reader Log.
What are the actions required for an irradiator malfunction?